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Chemistry · 2025 · 3 marks
CBSE 2025 · Region 2 · Set 2 · Q25
Write IUPAC names of the following coordination entities: (a) [ Fe ( en )_2 Cl_2]^+ (b) [ Co ( NH_3)_4( H_2 O ) Br ] SO_4 (c) [ Ni ( CN )_4]^2-
Write IUPAC names of the following coordination entities :
(a)
$\displaystyle \left[\mathrm{Fe}(\mathrm{en})_{2} \mathrm{Cl}_{2}\right]^{+}$
(b)
$\displaystyle \left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{4}\left(\mathrm{H}_{2} \mathrm{O}\right) \mathrm{Br}\right] \mathrm{SO}_{4}$
(c)
$\displaystyle \left[\mathrm{Ni}(\mathrm{CN})_{4}\right]^{2-}$
Marking-scheme solution
(a)
Dichloridobis(ethane-$\displaystyle 1,2$-diamine) iron(III) ion
(b)
Tetraammineaquabromidocobalt(III) sulphate
(c)
Tetracyanidonickelate(II) ion
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CBSE Class 12 Chemistry past-paper question from the 2025 board exam, with the answer as CBSE’s own marking scheme gives it. Where our answers come from.